[clang] [CIR][OpenMP] Implement lowering for the 'num_threads' clause for 'parallel' directive (PR #202466)

[Pedro da Rosa Pinheiro via cfe-commits]

pedropiin wrote:

@jsjodin Fixed it! If you could take a look whenever you get some time, I would be greatly appreaciated.

https://github.com/llvm/llvm-project/pull/202466